Ruthenium oxide catalysts for conversion of sulfur dioxide...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/78 (2006.01) B01J 23/46 (2006.01) B01J 23/56 (2006.01)

Patent

CA 2623027

The present invention relates generally to catalysts comprising ruthenium oxide and to processes for catalyzing the oxidation and conversion of sulfur dioxide (SO2) to sulfur trioxide (SO3) using such catalysts. SO2 at low concentrations in process gas streams can be effectively oxidized to SO3 at relatively low temperatures using the ruthenium oxide catalysts of the present invention. In one application, the ruthenium oxide catalysts are used in the final contact stage for conversion of SO2 to SO3 in multiple stage catalytic converters used in sulfuric acid manufacture.

D'une manière générale, la présente invention a trait à des catalyseurs à base d'oxyde de ruthénium et à des procédés pour la catalyse de l'oxydation et la conversion de dioxyde de soufre (SO2) en trioxyde de soufre (SO3) mettant en oeuvre de tels catalyseurs. Du SO2 à de faibles concentrations dans des flux de gaz de procédé peut être efficacement oxydé en SO3 à des températures relativement basses à l'aide de catalyseurs à base d'oxyde de ruthénium de la présente invention. Dans une utilisation, les catalyseurs à base d'oxyde de ruthénium sont utilisés dans l'étage de contact final pour la conversion de SO2 en SO3 dans des convertisseurs catalytiques à étages multiples utilisés dans la fabrication d'acide sulfurique.

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